'Regular physical activity -- even walking -- may be key to maintaining a sharp mind as we get older, two new studies suggest.
While that's not a new discovery, the studies plug critical gaps in the scientific literature and corroborate previous reports linking exercise to reduced rates of mental impairment in older adults.
The message is now clearer than ever: "If you stay physically active, you're buying protection for your brain," says Eric B. Larson, M.D., the vice president for research at Group Health Cooperative, a nonprofit health-care system based in Seattle.'
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